The spikes are more commonly used to stop birds resting and building nests on ledges and nooks on buildings

"Sometimes it's too easy to lose sight of the benefit that we all gain from trees and green spaces and from the presence of wildlife around us in the city."

Twitter user Jennifer Garrett wrote: "Our war on wildlife: now birds are not allowed in trees...?! Pigeon spikes spotted in Clifton, Bristol above a car park. Has anyone seen this before? How is it allowed?!"

Ms Garrett's tweet has been retweeted more than 200 times, with many other users coming out in support of her concerns.

Our war on wildlife: now birds are not allowed in trees...?! Pigeon spikes spotted in Clifton, Bristol above a car park. Has anyone seen this before? How is it allowed?!📷: thanks to Anna Francis pic.twitter.com/NuG9WvYBMj